Safety device for elevators.



lie-834,883; f V PATENTBD 1i0v.,-6, 1906.

- 'W.J.'BEAGH.

SAFETY DEVICE FOR- ELEVATORS.

I APPLICATION FILED JUNE 11, 1906.

WITNESSES. mum-6n.

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. UNITED STATES PATENT oEEioE.

WILLARD J. BEACH, or PITTSBURG, PENNSYLVANIA, ASSIGNOR To HEYL &PATTERSON .INOORPORATED, or PITTSBURG, PENNSYL! VANIA, A CORPORATION-OFPENNSYLVANIA.

SAFETY DEVICE FOR ELEVATORS- Specification of Letters Patent.

Patented Nov/. 6, 1906.

Application filed June'11,1906. Serial No. 321,221.

vented a newand useful Improvement in Safety Devices for Elevators and Ido hereby declare the following to be a full, clear, and exactdescription thereof.

My invention relates to a safety device for elevators, and moreespecially to that class of elevators in which an endless chain is employed carrying buckets.

The object of my invention is to rovide a Sim le and efficient form ofsafety evice for suc elevators which will come into play immediatelyupon the parting of the chain and which will act not only on theascending side ofdthe chain, but likewise onthe descending s1 e.v

To these ends my invention comprises the novel features hereinafter setforth and claimed. To enable others skilled in the art to make and usemy invention, I will describe the same with reference to theaccompanying drawings, in which Y Figure 1 is a side elevation, partlybroken away, of an elevator with my improved safety Fig. 2 is an en-,;

device applied thereto. larged cross-section on the line 2 2, Fig. 1;

and Figs. 3, 4, and 5 are enlarged detailed views.

Like numeralsindicate like parts.

My invention is adapted for use in connection with many forms of chainelevators, and I have illustrated it in connection with a very simpleform, in which the numeral 2 designates the base or hop er of theelevator; 3, the lower sprocketeel mounted therein, and 4 the u persprocket-wheel. The chains 5 may be of any ordinary construction, whichhave secured to their links at suitable intervals buckets 6. Theframework supporting the elevator comprises the vertical angle-bars 7,which are connected at intervals by plates 8, riveted thereto. Theseplates and anglebars form the elevator-shaft.

The safety devices which I am about to describe may be' installed atdiflerent points in the elevator-shaft or a single one may be employed,as desired.

A shaft 9 is journaled in bearings 10, supported by the plates 8, anddepending from said shaft 9 is the rock-arm 11, which has a recess 12formed inthe hub 13 of said arm 11, which is adapted to engage the pin14 in the shaft 9. A v

Mounted loosely on the pin 15 on the lower end of the arm 11 is the pawl15, which is normally in the-path of the ascending portion of the chain5, but which permits theascending of said chain without interference. I

A friction-block 16 is arranged to rest upon the guide-support 17, saidblock having the recess 18, which engages said sup ort. This support 17is supported bythe racket 19, secured to the plate 8 of the frame. Thisfriction-block 16 is recessed, as at 20, and within said recess the arm11 enters said block having the opening 21, through which the pin 15passes, which connects thelower end of the arm 11 to aid block.Connected to the arm 11 is the link 23 said link having the slot 24,engaging the pin '25 on said arm, the'opposite end of said lnkfe'ntering the rethe in 26.

T e castings 27 are bolted to the plates 8, and said castings formfriction-faces for the chains when the safety device is thrown intooperation, as fully hereinafter set forth.

The angle-bars 28 form guideways for the chains 5. j r

Secured to the end ofthe shaft 9 is the arm 30, which is adapted to comein contact with the switch 31 of any ordinary construction and break thecircuit and stop the motor which drives theelevator.

In the drawings "two strings of endless chains are employed, connectedby the buckets, as well as two safety devices, as illustrated in Fig. 2.

When the elevator is in operation and traveling in the directionindicated by the arrows, Fig. 1, the safety device remains inactive, thepawl 15 simply being thrown back out of the way of the ascending portionof the chain as each link passes it. If, however, a break occurs abovethe pawl in the ascendin portion of the chain, that portion below thebreak will of course drop and start to fall down the shaft, whereuponthe pawl 15 will be in position to catch the chain at once or will dropinto the first space in the chain that comes along, whereupon thefalling chain will be arrested, and at the same time the downward cess20 in said block and secured therein by 7 friction-block over intocontact with the descending portion of the chain and acting to arrestsaid chain by the friction created be tween said chain and the faces ofthe castings a The friction- 27 and the friction-block 16. block 16rests ordinarily upon the support 17, and when said block moves intofrictional contact with the .chain it is slightly lifted therefrom. Inthis position of the frictionblock 16 the pin and the link 23 will moveto the left of the slot 24. When the frictional block is at rest on thesupport 17, the pin 25 will be over at the right of said slot and allowsaid block to rest evenly on said support.

As the block 16 moves over the arm 11 is slightly shifted, so as tocarry the pin 14 over, and with it the shaft 9. This rocking of shaft 9throws the arm into contact with the switch 31, and the motor isstopped.

In my improvement I have provided a simple device by means of which thebroken section of chain is prevented from falling, while at the sametime a brake is applied to the other side of the chain, so as to checkit in its descent. The device not only becomes operative when the chainbreaks, but is of advantage in the case of high elevators hand-lingheavy material, where the device will act to stop the chain from runningbackward in case it should happen that the power is thrown off While theelevator is loaded.

What I claim is 1. In an elevator, the combination with a suitableframe, of an endlesss chain carrying buckets, a movable friction memberadapted to engage one portion of said chain, and a pawl carried therebynorm-ally in the path of the other portion of said chain.

2. In an elevator, the combination with a suitable frame, of an endlesschain carrying buckets, a sliding friction-block adapted to engage oneportion of said chain, and a pawl carried thereby normally in the pathof the other portion of said chain.

3. In an elevator, the combination with a ried by said block normally inthe path of one portion of said chain.

5. In an elevator, the combination with a suitable frame, of an endlesschain carrying buckets, a movable friction-block, a rockarm connectedthereto at its lower end, a link connecting said arm to said block between the ends of said arm, and a pawl carried by said block normally inthe path of one portion of said chain.

6. In an elevator, the combination with a suitable frame, of an endlesschain carrying buckets, a support on said frame, a slidingfriction-block engaging said support, and a pawl carried by said blocknormally in the path of one portion of said chain.

7. In an elevator, the combination with a suitable frame, of an endlesschain carrying I buckets, a movable friction-block, and means forthrowing said friction-block against the chain.

8. In an elevator, the combination with a suitable frame, of an endlesschain carrying buckets, a rock-arm, a movable frictionblock connected tosaid arm adapted to engage one portion of said chain, a shaft on whichsaid rock-arm is mounted, means for turning said shaft by the movementof said rock-arm, a switch operated by the movement of said shaft, and apawl carried by said block normally in the path of the other portion ofsaid chain.

In testimony whereof I, the said WILLARD J. BEACH, have hereunto set myhand.

WILLARD J. BEACH. Witnesses:

J. R. KELLER, RoBr. D. TorrEN.

